thanks Mike. this failure when the car was in for a timing belt change (routine). The engine ran ok for 10 minutes and was then switched off while the front discs were replaced. it hasn't started again since. is there anything you think they could have done to fry the ecu or is it more likely some wiring touching a hot part while it was running ? any ideas on cost of a replacement ecu ? its going to the ford dealer for further diagnosis on Monday.